After the release of v0.60 the path in worker.run from /data/filename to filename https://github.com/ffmpegjs/ffmpeg.js/blob/master/src/createWorker.js#L72
After the release of v0.60 the path in worker.run from /data/filename to filename https://github.com/ffmpegjs/ffmpeg.js/blob/master/src/createWorker.js#L72